Door-operating mechanism



(No Model.)

A. DITTMAR. DOOR OPERATING MECHANISM.

Patented June 1,1897.

UNITED STATES ATENT OFF CE.

AUGUST'DITTMAR, OF LAURENCE, OHIO.

DOOR-OPERATING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 583,877, dated June 1,1897.

Application filed October 16, 1896. Serial llo. 609,114. (No model.)

To all whom, it may concern.-

Be it known that I, AUGUST DITTMAR, a citizen of the United States,residing at North Laurence, in the county of Stark and State of Ohio,have invented a new and useful Door- Operating Mechanism, of which thefollowing is a specification.

My invention relates to improved mechanism for operating mine-doors.

As is well known the mouth or entrance to a mine is provided with doubledoors which require the constant presence of an attendant to open andclose as the loaded or unloaded cars pass out and in.

The object of my invention is to provide simple and effective mechanismfor opening and closing the doors and to automatically operate saidmechanism by the weight of the cars on a movable platform.

The invention will first be described in connection with theaccompanying drawings, and then pointed out in the claims.

Figure 1 of the drawings is a perspective view illustrating theapplication of my inven tion. Fig. 2 is a broken sectional view of thesame on the line 00 as, Fig. 1.

Referring to the drawings, A A represent the rails on which the carstravel, and B B the doors hinged to the usual frame, comprising uprights1 and cross-piece 2.

The mechanism for the operation of the doors being in duplicate thedescription of one side will suffice for both.

C represents a rock-shaft suitably j ournaled in blocks 3 below thedoor-frame. On each end of this shaft is rigidly secured a lever D, theouter end of which is provided with a weight E. On one end of shaft O isalso rigidly secured an upwardly-extending bar F, for a purposehereinafter described.

G represents an arm horizontally pivoted in a bracket g on the side ofupright 1, as shown. One end of this arm is connected to the upper endof bar F by means of a short link 4, its other end being connected by asimilar link 5 to a metal strip 6, secured to the door B.

The rails A terminate a short distance from the doors and are recessedat 7 to permit the platform-rails 8 to lie flush on the inner side.These platform-rails are secured on the edges of platforms l-I, oneplatform being on each side of the doors and pivoted at 9 to the mainrails A, as shown. The inner ends of the levers D project beneath andinto contact with the under sides of the platforms.

The operation of my improved mechanism is as follows: The advancing carmoves upon the platform H on one side of the doors and forces the samedownward, thereby rocking the shaft D, moving the upper end of bar Finward, pulling the inner end of arm G inward, and forcing its outer endoutward, and thus opening the doors. The platforms are so positionedthat before the car has entirely left the one on which it first moved itwill have passed onto the other platform, which has fallen to thelowered position by gravity when the first one moved downward. By thisconstruction the doors are kept open until the car has passed entirelyoff the second platform, thus preventing the interference of the car anddoors. When the car has passed off the second platform, the weights Ecause the inner ends of the levers D to move up ward, raising theplatforms to their normal positions, as shown in the drawings, thusreversing the above-described operation and closing the doors.

While I have shown and described my invention as applied to mine-doors,it is evident that it is equally applicable to other hinged doors, andalso that a single door. may be as effectively operated as double doors.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The combination, with the door and the movable platform on each sidethereof, of a rock-shaft suitably journaled below the door, a leversecured on each end of the rock-shaft, the inner ends of said leversprojecting beneath the platforms, and mechanism intermediate therock-shaft and door, whereby on the downward movement of the platformthe door is opened.

2. The combination, with the door and the movable platform on each sidethereof, of a rock-shaft suitably journaled below the door, a leversecured on each end of the rock-shaft, the inner ends of said leversprojecting beneath the platforms, their outer ends being provided withweights, and mechanism intermediate the rock-shaft and door, wherebydownward pressure on the platform causes the door to open, the weightson the levers acting to close the doors when the pressure on theplatforms is released.

3. The combination, with the door, of a platform pivotally secured oneach side of the door, a rock-shaft suitably journaled below the door, alever secured on each end of the rock-shaft, the inner ends of saidlevers projecting beneath the platforms, their outer ends being providedwith Weights, a horizontal arm pivotally secured to the door-frame, oneend of said arm being connected with the door and its other endconnected with the rock-shaft, whereby onmovement of the rockshaft thedoor is operated.

4. The combination, with the door, of a platform pivotally secured oneach side of the door, a rock-shaft suitably journaled below the door, alever secured on each end of the rock-shaft, the inner ends of saidlevers projecting beneath the platforms, their outer ends being providedwith Weights, an upwardly-extending bar rigidly secured on one end ofthe rock-shaft,and a horizontal arm pivotally secured to the door-frame,one end of said arm being connected with the door and its other endconnected with the free end of the bar, substantially as and for thepurposes stated.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two Witnesses.

AUGUST DITTMAR.

\Vitnesses:

CLYDE MYERs, MARY A. RUCH.

